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Thread: ''89 MM Brake Master Cyl. Repair

  1. #1

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    11-19-2011
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    34
    Location

    Albuquerque, NM
    Vehicle

    1989 Mitsubishi Mighty Max
    Engine

    G63B

    ''89 MM Brake Master Cyl. Repair

    Hi guys!!!

    I have a leak between my master cylinder reservoir and the cylinder body. There is an -0- ring connecting the 2, a only takes a little wiggle to see fluid leaking here. Looks like there's on screw on the cylinder holding the reservoir on.

    Anyone tried repairing this... hints or suggestions, or knows size of that -0- ring?

    And... if i can't match it, what do you think about disassembling and sealing the existing -0- ring with RV silicone?

  2. #2

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    12-10-2015
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    Wichita Falls, Texas
    Vehicle

    1991 Mitsubishi Mighty Max
    Engine

    4G64
    I can't say for sure what size the o ring is but you can go to any parts store and buy a box of assorted o rings for less than 10 bucks. I know you won't need that many but next time you'll have them and saves a trip. Ithe probably could be fixed with rtv but I'm not sure how long it would how up against brake fluid.

  3. #3

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    06-15-2014
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    Adelaide, South Australia
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    1985 Mitsubishi L200
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    G63B
    I would not recommend using any form of sealant in any part of the braking system. A wayward chunk of RTV silicone or teflon tape would easily block a relief valve or a port somewhere - say goodbye to brakes and hello to solid objects

  4. #4




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    03-20-2011
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    Location

    Pittsburgh, PA
    Vehicle

    1980 Dodge D-50
    Engine

    G54B
    that is more like a set of seals, not just O-rings. I had the same issue years ago and could not find the seals anywhere - they are all over eBay now.
    Pennyman1
    The best Dodge that Dodge never made
    Living the D-50 lifestyle since 1980

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